Genotypic stabilization of agronomic traits in Panicum maximum (Jacq.) hybrids
The objective of this study was to evaluate the genotypic stability of agronomic traits in hybrids of Panicum maximum. Hybrids originating from the crosses between two sexual parents and cultivars Mombasa and Tanzania were evaluated in an incomplete-block design. Evaluated traits were total dry matt...
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Sociedade Brasileira de Zootecnia
2015-11-01
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doaj-dca5cd9a813943d2b8a72ce1afacfea32020-11-24T22:09:52ZengSociedade Brasileira de ZootecniaRevista Brasileira de Zootecnia1806-92902015-11-01441137738310.1590/S1806-92902015001100001S1516-35982015001100377Genotypic stabilization of agronomic traits in Panicum maximum (Jacq.) hybridsThiago Gomes dos Santos BrazDilermando Miranda da FonsecaLiana JankCosme Damião CruzJanaina Azevedo MartuscelloThe objective of this study was to evaluate the genotypic stability of agronomic traits in hybrids of Panicum maximum. Hybrids originating from the crosses between two sexual parents and cultivars Mombasa and Tanzania were evaluated in an incomplete-block design. Evaluated traits were total dry matter, leaf dry matter, stem dry matter, percentage of leaves, and leaf:stem ratio. These traits were evaluated in six harvests. Overall, higher repeatability was observed for the traits total dry matter and leaf dry matter, especially when harvests 4, 5, and 6, occurring in spring and summer, were evaluated. The leaf dry matter was the trait that provided the greatest repeatability and determination. The repeatability of stem dry matter, percentage of leaves, and leaf:stem ratio had a low magnitude, even when the coefficient was estimated based on the harvests of better stabilization for the other variables. The hybrids achieved genotypic stabilization in the harvests made in the second rainy season. Harvests made in the rainy season provide greater repeatability and determination, and the inclusion of the dry-season harvest is detrimental to the process of selection of low-repeatability traits such as percentage of leaves.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982015001100377&lng=en&tlng=encoefficient of determinationforagerepeated measuresselection efficiency |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Thiago Gomes dos Santos Braz Dilermando Miranda da Fonseca Liana Jank Cosme Damião Cruz Janaina Azevedo Martuscello |
spellingShingle |
Thiago Gomes dos Santos Braz Dilermando Miranda da Fonseca Liana Jank Cosme Damião Cruz Janaina Azevedo Martuscello Genotypic stabilization of agronomic traits in Panicum maximum (Jacq.) hybrids Revista Brasileira de Zootecnia coefficient of determination forage repeated measures selection efficiency |
author_facet |
Thiago Gomes dos Santos Braz Dilermando Miranda da Fonseca Liana Jank Cosme Damião Cruz Janaina Azevedo Martuscello |
author_sort |
Thiago Gomes dos Santos Braz |
title |
Genotypic stabilization of agronomic traits in Panicum maximum (Jacq.) hybrids |
title_short |
Genotypic stabilization of agronomic traits in Panicum maximum (Jacq.) hybrids |
title_full |
Genotypic stabilization of agronomic traits in Panicum maximum (Jacq.) hybrids |
title_fullStr |
Genotypic stabilization of agronomic traits in Panicum maximum (Jacq.) hybrids |
title_full_unstemmed |
Genotypic stabilization of agronomic traits in Panicum maximum (Jacq.) hybrids |
title_sort |
genotypic stabilization of agronomic traits in panicum maximum (jacq.) hybrids |
publisher |
Sociedade Brasileira de Zootecnia |
series |
Revista Brasileira de Zootecnia |
issn |
1806-9290 |
publishDate |
2015-11-01 |
description |
The objective of this study was to evaluate the genotypic stability of agronomic traits in hybrids of Panicum maximum. Hybrids originating from the crosses between two sexual parents and cultivars Mombasa and Tanzania were evaluated in an incomplete-block design. Evaluated traits were total dry matter, leaf dry matter, stem dry matter, percentage of leaves, and leaf:stem ratio. These traits were evaluated in six harvests. Overall, higher repeatability was observed for the traits total dry matter and leaf dry matter, especially when harvests 4, 5, and 6, occurring in spring and summer, were evaluated. The leaf dry matter was the trait that provided the greatest repeatability and determination. The repeatability of stem dry matter, percentage of leaves, and leaf:stem ratio had a low magnitude, even when the coefficient was estimated based on the harvests of better stabilization for the other variables. The hybrids achieved genotypic stabilization in the harvests made in the second rainy season. Harvests made in the rainy season provide greater repeatability and determination, and the inclusion of the dry-season harvest is detrimental to the process of selection of low-repeatability traits such as percentage of leaves. |
topic |
coefficient of determination forage repeated measures selection efficiency |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982015001100377&lng=en&tlng=en |
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